25435691 has 2 divisors, whose sum is σ = 25435692. Its totient is φ = 25435690.

The previous prime is 25435681. The next prime is 25435693. The reversal of 25435691 is 19653452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25435691 - 2¹⁰ = 25434667 is a prime.

It is a Sophie Germain prime.

Together with 25435693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25435693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12717845 + 12717846.

It is an arithmetic number, because the mean of its divisors is an integer number (12717846).

Almost surely, 2^25435691 is an apocalyptic number.

25435691 is a deficient number, since it is larger than the sum of its proper divisors (1).

25435691 is an equidigital number, since it uses as much as digits as its factorization.

25435691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 35.

The square root of 25435691 is about 5043.3809096676. The cubic root of 25435691 is about 294.0906248766.

The spelling of 25435691 in words is "twenty-five million, four hundred thirty-five thousand, six hundred ninety-one".